As the the Republican presidential nomination gets underway with the Iowa caucus Doug Holtz-Eakin, former chief economic policy adviser to U.S. Senator John McCain and economist Troy Davig at Barclays Capital discuss the main issue facing the US in 2012. Justin Rowlatt explores the eerie mask which has become the face of global protest. And our technology commentator Jeremy Wagstaff decides it's time for a New Year's clear-out of online accounts.